AccessViolationException in v5.5 preview

After upgrading version 5.0.2.0 to version 5.4.9.6 RDM crashes within 5 minutes after starting RDM. I can not find a cause for it, it also happens when i have no sessions open, when RDM is minimized to the tray area.

This is the error:

AccessViolationException - Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at Devolutions.RemoteDesktopManager.Program.Main(String[] aArgs)